https://www.njtransit.com/meadowlands

Here’s the link, they update it closer to the concert date with exact train times. From NYC, you’d change in Secaucus to a MetLife bound special trains.

Returning, you’d do the reverse, there’s shuttle trains every 10ish minutes to Secaucus, then you take any NYC-bound train back into Manhattan. You will likely wait at the MetLife station with other fans, so be prepared. Each train carries roughly a thousand people, every 10 minutes, so it depends on your artist’s popularity and whether a lot of other fans are going back to NYC. There’s usually good customer service helping you make the transfer at SEC.

The main problem with staying in NJ is that you’re competing with tens of thousands of fans for cabs, and then for road space. The nearby hotels on Rt 120 are geographically close but really not at all walkable to MetLife (unless you like walking on the side of a highway and entrance ramps without a sidewalk or shoulders).

I’d suggest staying around midtown, there’s lots of hotels there. There’s also decent options in the Long Island City/Queensboro Plaza area of Queens, and in downtown Brooklyn.